any maths gurus out there?
Turbo Mini Forums

So if you have a 40mm tube inside diameter how many square mm will the hole be?

Then...

if you have a 48mm I/D tube how may square mm would the hole be?

Them as a percentage how much bigger would the bigger hole be over the smaller hole??

God i wish i had pay some attention!!!

JF.

40mm = 1256mm squared
48 = 1809mm squared
44% increase

(I hope thats right)

180.96mm I got it to.

48mm ID has an area of 1809 Square mm

40mm ID has an area of 1256 square mm

I make 48mm ID to have a 30odd% larger internal area

Edited by SumpNut on 20th Feb, 2006.

Pi*r^2 (r = radius)

Pi * 20 * 20 = 1256mm^2

and

Pi * 24 * 24 = 1809mm^2

Percentage is a bit odd though I guess the easiest way is:

If you take the bigger to be 100% then

1256/1809 * 100 = 69%

so 40mm tube is 31% smaller area.

Ben

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

bugger we all got a different percentage

1256 *1.44 (44% extra) gives 1809

its 44% because: eg a 1.5m long pole is 50% longer than a 1.0m pole 1.5/1.0 = 1.5 whereas 1.0/1.5 = 0.67 which is wrong

Well, you will get different percentages because 1% of each area is different. That means the smallest is 31% smaller compared to the big one, but the largest is 44% compared to the small one :)

Easy!

yep just giving an example everyone can understand, is easy if you think of it with those easy numbers

so the larger pipe is 44% bigger?

It is the measurements of a standard MG Metro turbo down pipe over a Maniflow item that most of us use on T3's.

Thanks all.

JF

Hi jack

If I have a std size 1.750" crank pin dia,and put a rod and piston in with a -.020 shell on (like some wazzuk did) just the top part of the rod.......

How much higher would the piston be

I can't work it out

Metro turbo weekend driver,Mini turbo in the making again!

yep thats right jon the bigger one is 44% larger i assume this is the maniflow one?

Still Pissing in the wind if your elbow hasn't been opened out!

Dave please!

Edited by giallofly on 20th Feb, 2006.

hee hee!!!

Was this already done on your 'front running' racer - or is this even more then? I'm guessing the latter?